How to populate attribute fields from requisition to PO when PO auto generated from the approved req

Hello

We are in R12.1.3, we have  a custom interface in which we are getting the requisition data from flat file and I am populating the additional data in attribute fields in the Po_Requisitions_Interface_All table  and after

Requisition Import I  am seeing that data in attribute1 in po_requisition_lines_all table. We have the setup which will create the approved PO automatically for that requisition. I want to know how to populate/pass po_requisition_lines_all.attribute1 field to po_lines_all.attribute1 table when PO got created automatically?

Thanks!